xReM1x
Member level 5

hi, I built this simple circuit just for fun :
**broken link removed**
as you can see, it is basically a transistor switch that shoud open or close depends on the base current, the problem is, when I built this circuit, it works fine if the voltage to the led is less than ~1.5V (RED LED rated at 2.1V 20mA) but when the voltage is 2.1V its like there is capacitance at the gate, the led just doesnt flash to music like it is flashing in 1.5V or lower.
its like there is capacitance at the gate that changes with voltage. I also simulated the schematic and it works fine in ltspice.
I tried connecting it to my PC and to my phone, I tried 2 power supplys, tried also PNP and also NPN transistors, tried anything twice and the led doesnt work in it rated voltage.
anybody have any idea?
**broken link removed**
as you can see, it is basically a transistor switch that shoud open or close depends on the base current, the problem is, when I built this circuit, it works fine if the voltage to the led is less than ~1.5V (RED LED rated at 2.1V 20mA) but when the voltage is 2.1V its like there is capacitance at the gate, the led just doesnt flash to music like it is flashing in 1.5V or lower.
its like there is capacitance at the gate that changes with voltage. I also simulated the schematic and it works fine in ltspice.
I tried connecting it to my PC and to my phone, I tried 2 power supplys, tried also PNP and also NPN transistors, tried anything twice and the led doesnt work in it rated voltage.
anybody have any idea?